Refrigeration unit control with shutdown evaluation and automatic restart
US5454229A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1994 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | May 18, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2500/26
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
Methods and apparatus for monitoring conditions which may cause shut down of a refrigeration unit. When a condition of the refrigeration unit is detected which requires shut down, a shut down counter is incremented and the shut down is made with the provision for automatic restart of the refrigeration unit in response to predetermined parameters of the refrigeration unit. When the predetermined parameters initiate automatic re-start of the refrigeration unit, a timer is started. If the refrigeration unit operates for a predetermined period of time without shut down, the counting means is reset. A shut down before expiration of the predetermined timing period again increments the shut down counter. In one embodiment, when a predetermined condition which may cause shut down approaches a predetermined shut down value, the methods and apparatus modify the operation of the refrigeration unit one or more times in an attempt to prevent shut down. A predetermined count value on the shut down counter prevents further automatic re-starts of the refrigeration unit. In a preferred embodiment, the monitored conditions which may cause shut down are the high side pressure of the refrigeration uni…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.